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IfThenElse, Pandaboard and high temperatures.

With the currently high temperatures (30 degrees Celsius outside) my pandaboard in a box ™ runs a little hotter then what I like. Currently it easily sits above 60 degrees. So I decided to add a little fan. However, fans make an awful lot of noise, so we do not want to run the fan, if not needed. So I decided to use one of the GPIO pins on the pandaboard. So after doing some level conversion & inversion (1.8 -> 5V) I could safely switch on/off the fan.

Now to make it temperature controlled, this is where IfThenElse pops in: